(CNN) – Mark Sanford overcame the latest hurdle in his South Carolina political redemption tour, ending Tuesday night with a concession from his opponent in the GOP primary runoff for a U.S. House seat.

Results showed the former South Carolina governor had 57% of the vote, compared with 43% held by former Charleston City Councilman Curtis Bostic. That was a difference of about 6,000 votes out of about 45,000 cast.